Template for master slave mariadb configuration

group_vars/all

@@ -2,4 +2,6 @@
 # Variables listed here are applicable to all host groups
 
 repository: https://github.com/jcwimer/wrestlingApp.git
+replication_password: something
+read_write_password: something
 

group_vars/dbservers

@@ -1,9 +0,0 @@
----
-# The variables file used by the playbooks in the dbservers group.
-# These don't have to be explicitly imported by vars_files: they are autopopulated.
-
-mysqlservice: mysqld
-mysql_port: 3306
-dbuser: foouser
-dbname: foodb
-upassword: abc

hosts

@@ -4,18 +4,20 @@ webhostname
 [workers]
 woker1
 
-[dbfirstclustermachine]
+[masterdb]
-db1-hostname
+db1-hostname server_id=1
 
-[dbservers]
+[slavedbs]
-db2-hostname
+db2-hostname server_id=2
-db3-hostname
+db3-hostname server_id=3
 
 [haproxy]
 haproxy-hostname
 
-[db-internal-ips]
+[masterdb-internal]
 
-[web-internal-ips]
+[slavedbs-internal]
 
-[proxy-internal-ip]
+[web-internal]
+
+[proxy-internal]

roles/db/tasks/main.yml

@@ -1,5 +1,7 @@
 ---
 # This installs mariadb and galera on db nodes
+# https://mariadb.com/blog/devops-mariadb-part-1
+# https://mariadb.com/blog/devops-mariadb-and-ansible-part-2
 
 - name: Update apt
   apt: update_cache=yes
@@ -7,15 +9,23 @@
 - name: Install software properties
   apt: name=software-properties-common state=present
 
-- name: Add galera apt repo
+- name: Install MariaDB repository
-  apt_key: url=hkp://keyserver.ubuntu.com:80 0xcbcb082a1bb943db
+  apt_repository: repo='deb http://ftp.igh.cnrs.fr/pub/mariadb/repo/10.1/ubuntu trusty main' state=present
-  apt_repository: repo='deb [arch=amd64,i386] http://ftp.osuosl.org/pub/mariadb/repo/10.1/ubuntu trusty main'
 
-- name: Update apt
+- name: Add repository key to the system
-  apt: udpate_cache=yes
+  apt_key: keyserver=keyserver.ubuntu.com id=0xcbcb082a1bb943db
 
-- name: Install mariadb
+- name: Install MariaDB Server
-  apt: name=mariadb-server state=present
+  apt: name=mariadb-server state=latest update_cache=yes
 
+- name: Install python module
+  apt: name=python-mysqldb state=installed
 
+- name: Create replication account
+  mysql_user: name=repl host="%" password={{ replication_password }} priv=*.*:"REPLICATION SLAVE" state=present
 
+- name: Create readwrite user
+  mysql_user: name=rwuser host="%" password={{ read_write_password }} priv=*.*:SELECT,INSERT,UPDATE,DELETE,CREATE,DROP state=present
+
+- name: Modify configuration file to listen on all interfaces
+  lineinfile: dest=/etc/mysql/my.cnf regexp="^bind-address" line="bind-address=0.0.0.0"

roles/masterdb/tasks/main.yml

@@ -0,0 +1,13 @@
+---
+# This sets up the wrestlingtourney database and starts the binlogs
+# https://mariadb.com/blog/devops-mariadb-part-1
+# https://mariadb.com/blog/devops-mariadb-and-ansible-part-2
+
+- name: Modify configuration file to setup server ID
+  lineinfile: dest=/etc/mysql/my.cnf regexp="^#server-id" line="server-id=1"
+
+- name: Restart mysql service
+  service: name=mysql state=restarted
+
+- name: Reset master binlog
+  command: /usr/bin/mysql -u root -e "RESET MASTER"

roles/slavedb/tasks/main.yml

@@ -0,0 +1,13 @@
+---
+# This installs mariadb and galera on db nodes
+# https://mariadb.com/blog/devops-mariadb-part-1
+# https://mariadb.com/blog/devops-mariadb-and-ansible-part-2
+
+- name: Modify configuration file to setup server ID
+  lineinfile: dest=/etc/mysql/my.cnf regexp="^#server-id" line="server-id=2"
+
+- name: Setup replication
+  command: /usr/bin/mysql -uroot -e "CHANGE MASTER TO master_host='192.168.50.2', master_user='repl', master_password='{{ replication_password }}', master_use_gtid=current_pos"
+
+- name: Restart mysql service
+  service: name=mysql state=restarted

site.yml

@@ -24,20 +24,21 @@
    - applicationvars
    - worker
 
-- name: deploy first db and create cluster
+- name: deploy master db
-  hosts: dbfirstclustermachine
+  hosts: masterdb
   remote_user: root
 
   roles:
     - db
-    - firstdb
+    - masterdb
 
 - name: deploy mysql and configure database
-  hosts: dbservers
+  hosts: slavedbs
   remote_user: root
 
   roles:
    - db
+   - slavedb
 
 - name: deploy haproxy
   hosts: proxy